Abstract: In comparison to the average precipitation per capita in the world, the precipitation per capita in Korea is low, so, it is difficult to secure available water resources in Korea. To solve this issue, the method of reusing the water was used. In this study, the virtual environment is created on the undercurrent facility and the storage period of water inflow andthe changes in the hydrogen ion concentration are measured. The tool used in the measurement was the Arduino-based Sensor (SEN-0161) andthis test results were used to inspect the stability on the method of reusing the water.